You can see three almost identical images below. Can you spot the odd one out from them?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

What has 13 hearts but no other organs?

0 0 0 = 6
1 1 1 = 6
2 2 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

You can use any mathematical symbols in the space provided to make all above algebraic expressions true.

Why is the Hole below a Lock?

A man has eighty-one cows ( numbered 1,2,3...81 as such). The beauty is that cow no. 1 gives 1ltr of milk, cow no. 2 gives 2ltrs of milk and so on. The man wants to equally distribute the cows among his nine sons so that each one of them gets the same quantity of milk.

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?